Writing instrument



FIG. 1 is a front, right perspective view of a writing instrument according to the present invention.

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a left side elevational view thereof; the right side elevational view being an exact mirror image thereof;

FIG. 5 is a top end view thereof; and,

FIG. 6 is a bottom end view thereof.

The broken lines on the pen are included for the purpose of illustrating environment and form no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 